Don't use location cache if not needed

src/extractor/extractor.cpp

@@ -453,9 +453,10 @@ Extractor::ParseOSMData(ScriptingEnvironment &scripting_environment,
         osmium::io::Reader reader(
             input_file, osmium::osm_entity_bits::node | osmium::osm_entity_bits::way, read_meta);
 
-        // TODO: make location_cacher conditional
         const auto pipeline =
-            buffer_reader(reader) & location_cacher & buffer_transformer & buffer_storage;
+            scripting_environment.HasLocationDependentData() && config.use_locations_cache
+                ? buffer_reader(reader) & location_cacher & buffer_transformer & buffer_storage
+                : buffer_reader(reader) & buffer_transformer & buffer_storage;
         tbb::parallel_pipeline(num_threads, pipeline);
     }
 

src/extractor/scripting_environment_lua.cpp

@@ -302,6 +302,8 @@ void Sol2ScriptingEnvironment::InitContext(LuaScriptingContext &context)
         [](const osmium::Way &way) { return sol::as_table(way.nodes()); },
         "get_location_tag",
         [&context](const osmium::Way &way, const char *key) {
+            if (context.location_dependent_data.empty())
+                return sol::object(sol::nil);
             // HEURISTIC: use a single node (last) of the way to localize the way
             // For more complicated scenarios a proper merging of multiple tags
             // at one or many locations must be provided